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WHITE METAL                                    265

2. DETERMINATION OF THE TIN, ANTIMONY, COPPER, IRON AND ZINC.
The alcoholic solution is evaporated with 2-3 grams of tartaric acid until
the alcohol is completely expelled, the residue being taken up in water
and the liquid made faintly alkaline with concentrated sodium hydroxide
solution and treated with colourless sodium sulphide solution in very slight
excess. The liquid is heated on the water-bath and filtered, the subsequent
procedure being that for the gravimetric analysis of alloys with a tin-anti-
mony basis containing a little copper (see p. 263).

3. Alloys with a Lead-Antimony Basis

These alloys usually contain 75-90% Pb, 10-25% Sb, and small quan-
tities of tin and copper (o'5-2%). Their complete analysis is carried out
by the methods given for hard lead.

*
* *

White metals vary in composition according to their uses, the analytical
results for some of the commoner types being as follows :

TABLE   XXXIII
Composition of White Metal

Type.
	Sn
	Pb
	Sb
	Cu
	Fe
	Zn

Antifriction metals :
	
	
	
	
	
	

Adopted by the Italian Railways   .
	83
	
	II
	6
	
	

,,      French        ,,
	83-33
	
	II-II
	5-55
	 
	

,,                  Russian       ,,          -
	90
	
	8
	2
	
	

1
	78-5
	
	n-5
	IO
	
	. 

German       ,,
	83
	
	ii
	6
	
	

            ,,      Austrian      ,,
	82
	
	12
	6
	
	

English white bearing metal
	76-7
	
	15-5
	7-8
	
	

Britannia metal   ......
	90-92
	
	8-9
	up to 3
	
	

Antifriction and fittings metals :
	
	
	
	
	
	

Adopted by the Italian Railways  .
	14
	76
	10
	 '
	
	 

,,                  French Northern
	
	
	
	
	
	

,,            ,,          Railway
	12
	73
	15
	
	
	

,,            ,,      French   Eastern
	
	
	
	
	
	

Railway .
	12
	80
	8
	 
	
	

by    certain    German
	
	
	
	
	
	

Railways .
	42
	42
	16
	 
	
	

Graphite metal'   ......
	15
	68
	J7
	
	
	

English bearing metal    ....
	53
	33
	10-6
	2-4
	
	I

American antifriction metal
	
	78-4
	19-6
	 <
	0-7
	I

Type metal    .     .          ....
	I 52 5
	rQ_ec;
	25 3O
	trace
	__
	__ ,


	^ J      J
 5
	J       *y*_)
 80
	" J    Ow
 15
	trace
	_
	

Magnolia metal         .....
	__
	8V5
	l6'4.
	__
	__
	__


	
	O J
 78
	A        *T
 21
	
	
	

ron and zinc present.